CN115504468A - Modification method for improving walnut shell based active carbon toluene adsorption breakthrough time - Google Patents
Modification method for improving walnut shell based active carbon toluene adsorption breakthrough time Download PDFInfo
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- 235000009496 Juglans regia Nutrition 0.000 title claims abstract description 68
- 235000020234 walnut Nutrition 0.000 title claims abstract description 68
- 238000001179 sorption measurement Methods 0.000 title claims abstract description 43
- 238000002715 modification method Methods 0.000 title claims abstract description 25
- LRHSENVDAQAWKP-UHFFFAOYSA-N [C].CC1=CC=CC=C1 Chemical compound [C].CC1=CC=CC=C1 LRHSENVDAQAWKP-UHFFFAOYSA-N 0.000 title abstract description 12
- 240000007049 Juglans regia Species 0.000 title 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 113
- 241000758789 Juglans Species 0.000 claims abstract description 67
- 238000001035 drying Methods 0.000 claims abstract description 23
- 239000012535 impurity Substances 0.000 claims abstract description 22
- 239000000126 substance Substances 0.000 claims abstract description 21
- 230000004913 activation Effects 0.000 claims abstract description 18
- 238000005245 sintering Methods 0.000 claims abstract description 18
- 238000000034 method Methods 0.000 claims abstract description 14
- 238000002791 soaking Methods 0.000 claims abstract description 11
- 238000001914 filtration Methods 0.000 claims abstract description 9
- 238000009210 therapy by ultrasound Methods 0.000 claims abstract description 9
- 238000004140 cleaning Methods 0.000 claims abstract description 3
- 238000002156 mixing Methods 0.000 claims abstract description 3
- 238000007873 sieving Methods 0.000 claims abstract description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 39
- 229910052799 carbon Inorganic materials 0.000 claims description 26
- 239000010420 shell particle Substances 0.000 claims description 18
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 16
- 239000008367 deionised water Substances 0.000 claims description 16
- 229910021641 deionized water Inorganic materials 0.000 claims description 16
- 238000010438 heat treatment Methods 0.000 claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 238000005406 washing Methods 0.000 claims description 10
- 230000007935 neutral effect Effects 0.000 claims description 8
- 239000002904 solvent Substances 0.000 claims description 8
- 230000000630 rising effect Effects 0.000 claims description 6
- 238000002604 ultrasonography Methods 0.000 claims description 4
- 239000012299 nitrogen atmosphere Substances 0.000 claims description 3
- 239000012855 volatile organic compound Substances 0.000 abstract description 7
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000002360 preparation method Methods 0.000 abstract description 2
- 239000012298 atmosphere Substances 0.000 description 13
- 238000010000 carbonizing Methods 0.000 description 6
- 239000003463 adsorbent Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000002243 precursor Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000003795 desorption Methods 0.000 description 2
- 125000000524 functional group Chemical group 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 238000006065 biodegradation reaction Methods 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
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- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/30—Active carbon
- C01B32/312—Preparation
- C01B32/318—Preparation characterised by the starting materials
- C01B32/324—Preparation characterised by the starting materials from waste materials, e.g. tyres or spent sulfite pulp liquor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/20—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising free carbon; comprising carbon obtained by carbonising processes
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/30—Active carbon
- C01B32/312—Preparation
- C01B32/342—Preparation characterised by non-gaseous activating agents
- C01B32/348—Metallic compounds
Abstract
The invention relates to the field of VOCs adsorption, and provides a modification method for improving adsorption breakthrough time of walnut shell-based activated carbon toluene, which comprises the following steps: the method comprises the following steps: cleaning walnut shells, crushing, sieving, removing impurities, and placing in an oven for drying at constant temperature; step two: sintering at high temperature to obtain B-AC; step three: mixing with KOH, and sintering again to complete chemical activation; step four: soaking in HCl solution to remove ash and impurities to obtain K-AC; step five: and (4) carrying out ultrasonic treatment, filtering and drying at constant temperature to obtain the target activated carbon ACs. The modification method disclosed by the invention is green and efficient, convenient to operate, low in cost and beneficial to large-scale preparation.
Description
Technical Field
The invention relates to the field of VOCs adsorption, in particular to a modification method for improving the adsorption breakthrough time of walnut shell-based activated carbon toluene.
Background
O 3 Has become a primary factor leading to the over-standard quality of air in some cities. VOCs being formed of O 3 The important precursors mainly exist in original and auxiliary materials or products of enterprises, most of the precursors are inflammable and explosive, and the other precursors belong to toxic and harmful substances, and the strengthening of VOCs treatment is the control of O at the present stage 3 The effective way of pollution is also a powerful means for helping enterprises to save resources, improve benefits and reduce potential safety hazards.
The VOCs treatment method mainly comprises adsorption and absorption, condensation, membrane separation, plasma decomposition, catalytic oxidation, direct combustion and biodegradation. The volatile organic compounds can be accumulated by adsorption, and the adsorbent material can be reused by thermal desorption or vacuum desorption. Adsorption technology is considered an effective and economical control strategy because of its potential to recover and reuse adsorbent materials and volatile organic compounds. The activated carbon has good physical and chemical properties such as large specific surface area, rich functional groups, good chemical stability, high mechanical strength, acid and alkali resistance and the like, so that the activated carbon becomes the most widely applied adsorbing material.
There are many methods for modifying activated carbon, such as adding surface functional groups, but most methods are complicated and cause secondary pollution. The invention changes the specific surface area, the pore size structure distribution and the like of the active carbon through chemical and physical modification so as to increase the adsorption breakthrough time and the adsorption capacity, and the process is efficient and green.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a modification method for improving the toluene adsorption breakthrough time of walnut shell-based activated carbon.
The purpose of the invention is realized by adopting the following technical scheme:
the modification method for improving the adsorption breakthrough time of the walnut shell-based active carbon toluene has the advantages of high efficiency, greenness, low cost and easiness in operation.
A modification method for improving the walnut shell based active carbon toluene adsorption breakthrough time comprises the following steps:
the method comprises the following steps: cleaning walnut shells, crushing, sieving, removing impurities, and placing in an oven for drying at constant temperature to obtain walnut shell particles;
step two: sintering the walnut shell particles obtained in the step one at a high temperature to obtain B-AC;
step three: mixing the carbonized carbon B-AC of the walnut shells obtained in the step two with KOH, sintering again, and completing chemical activation to obtain KOH activated carbon;
step four: soaking the KOH-activated carbon obtained in the third step in an HCl solution to remove ash and impurities, washing the KOH-activated carbon to be neutral by using deionized water, and then putting the KOH-activated carbon into a constant-temperature oven to dry overnight to obtain chemically activated carbon K-AC;
step five: and putting the K-AC obtained in the step four into an ethanol solvent, performing ultrasonic treatment for 10-20min at the power of 10-40kHz, filtering, and drying at constant temperature to obtain the target activated carbon ACs.
Preferably, in the first step, the walnut shells are sieved to have a mesh size of 30-40 meshes.
Preferably, in the first step, the impurity removal is to remove the impurity by washing with deionized water, and placing the mixture in an oven at a constant temperature.
Preferably, in the second step, the sintering is carried out in a tube furnace, the temperature rising rate is 4 ℃/s, the temperature rising temperature is 600 ℃, the sintering is carried out in the atmosphere of nitrogen, and the sintering time is 1h.
Preferably, in the third step, B-AC is mixed with KOH in a mass ratio of 1.
Preferably, in the third step, the second sintering is performed in a tube furnace, the temperature rising rate is 4 ℃/s, the temperature rising temperature is 800 ℃, the sintering is performed in the nitrogen atmosphere, and the sintering time is 1h.
Preferably, in the fourth step, the concentration of the HCl solution is 5mol/L, and the soaking time is 8h.
Preferably, in the fourth step, the power of the ultrasound is 10-40kHz, and the time is 10-20min.
Preferably, the drying time of the first step, the fourth step and the fifth step is 12 hours.
Preferably, the oven temperature of the first step is 100 ℃; the oven temperature of the fourth step is 110 ℃; the oven temperature of the fifth step is 80 ℃.
The invention has the beneficial effects that:
the modification method disclosed by the invention is green and efficient, convenient to operate, low in cost and beneficial to large-scale preparation.
According to the detection data of the invention, under the same conditions (50 mg of adsorbent in a toluene adsorption bed with initial concentration of 650 ppm), the adsorption breakthrough time of the chemically activated carbon K-AC is 90min, the adsorption breakthrough time of the chemically activated and physically activated carbon ACs is 138min, and the adsorption breakthrough time is increased by 48min.
Drawings
The invention is further illustrated by means of the attached drawings, but the embodiments in the drawings do not constitute any limitation to the invention, and for a person skilled in the art, without inventive effort, further drawings may be derived from the following figures.
FIG. 1 shows chemically activated K-AC and chemically and physically activated AC of activated carbon prepared in example 4 of the present invention T10W40 Adsorption breakthrough curve diagram;
FIG. 2 is a graph showing the breakthrough of adsorption of various activated carbons by physical ultrasonic activation at 10-40kHz for the same time of 10min;
FIG. 3 is a graph showing the breakthrough curves of adsorption of various activated carbons activated by physical ultrasound at the same power of 40kHz for 10-30 min.
Detailed Description
For the purpose of more clearly illustrating the present invention and more clearly understanding the technical features, objects and advantages of the present invention, the technical solutions of the present invention will now be described in detail below, but are not to be construed as limiting the implementable scope of the present invention.
The starting materials, reagents or apparatuses used in the following examples are, unless otherwise specified, either commercially available from conventional sources or can be obtained by known methods.
The invention is further described with reference to the following examples.
Example 1
A modification method for improving the walnut shell based active carbon toluene adsorption breakthrough time comprises the following steps:
firstly, the walnut shell based active carbon is chemically activated, and the specific implementation steps are as follows
The method comprises the following steps: the walnut shells are cleaned, crushed and sieved by a 30-40 mesh sieve, washed by deionized water to remove impurities, and placed in an oven for drying at constant temperature to obtain walnut shell particles.
Step two: heating the walnut shell particles obtained in the step one to 600 ℃ in a tubular furnace at the temperature of 4 ℃/s, and heating the walnut shell particles in N 2 Carbonizing for 1h under the atmosphere to obtain B-AC;
step three: heating the carbonized walnut shells obtained in the step two to 800 ℃ at the temperature of 4 ℃/s in a tubular furnace according to the mass ratio of 1 2 Chemical activation is carried out for 1h under the atmosphere;
step four: and (4) soaking the KOH-activated carbon obtained in the step three in a 5M HCl solution for 8 hours to remove ash and impurities, washing the carbon with a large amount of deionized water to be neutral, and then putting the carbon into a constant-temperature oven for drying overnight to obtain the K-AC.
Step five: putting the K-AC into an ethanol solvent, performing ultrasonic treatment for 10min at the power of 10kHz, filtering, and drying at constant temperature to obtain activated carbon AC subjected to chemical and physical activation T10W10 。
Example 2
A modification method for improving the walnut shell based active carbon toluene adsorption breakthrough time comprises the following steps:
firstly, the walnut shell-based active carbon is chemically activated, and the specific implementation steps are as follows
The method comprises the following steps: the walnut shells are cleaned, crushed and sieved by a 30-40 mesh sieve, washed by deionized water to remove impurities, and placed in an oven for drying at constant temperature to obtain walnut shell particles.
Step two: heating the walnut shell particles obtained in the step one to 600 ℃ in a tube furnace at the temperature of 4 ℃/s in N 2 Carbonizing for 1h under the atmosphere to obtain B-AC;
step three: heating the carbonized walnut shells obtained in the step two to 800 ℃ at the mass ratio of 1 ℃/s to KOH in a tubular furnace at the temperature of 4 ℃/s, wherein the mass ratio of the carbon B-AC to the KOH is 2 Chemical activation is carried out for 1h under the atmosphere;
step four: and (4) soaking the KOH-activated carbon obtained in the step three in a 5M HCl solution for 8 hours to remove ash and impurities, washing the carbon with a large amount of deionized water to be neutral, and then putting the carbon into a constant-temperature oven for drying overnight to obtain the K-AC.
Step five: putting the K-AC into an ethanol solvent, performing ultrasonic treatment for 10min at the power of 20kHz, filtering, and drying at constant temperature to obtain activated carbon AC subjected to chemical and physical activation T10W20 。
Example 3
A modification method for improving the walnut shell based active carbon toluene adsorption breakthrough time comprises the following steps:
firstly, the walnut shell based active carbon is chemically activated, and the specific implementation steps are as follows
The method comprises the following steps: the walnut shells are cleaned, crushed and sieved by a 30-40 mesh sieve, washed by deionized water to remove impurities, and placed in an oven for drying at constant temperature to obtain walnut shell particles.
Step two: heating the walnut shell particles obtained in the step one to 600 ℃ in a tubular furnace at the temperature of 4 ℃/s, and heating the walnut shell particles in N 2 Carbonizing for 1h under the atmosphere to obtain B-AC;
step three: heating the carbonized walnut shells obtained in the step two to 800 ℃ at the temperature of 4 ℃/s in a tubular furnace according to the mass ratio of 1 2 Chemical activation is carried out for 1h under the atmosphere;
step four: and (3) soaking the carbon activated by the KOH obtained in the step three in a 5M HCl solution for 8 hours to remove ash and impurities, washing the carbon with a large amount of deionized water to be neutral, and then putting the carbon into a constant-temperature oven to be dried overnight to obtain the K-AC.
Step five: putting the K-AC into an ethanol solvent, performing ultrasonic treatment for 10min at the power of 30kHz, filtering, and drying at constant temperature to obtain activated carbon AC subjected to chemical and physical activation T10W30 。
Example 4
A modification method for improving the walnut shell based active carbon toluene adsorption breakthrough time comprises the following steps:
firstly, the walnut shell-based active carbon is chemically activated, and the specific implementation steps are as follows
The method comprises the following steps: the walnut shells are cleaned, crushed and sieved by 30-40 meshes, washed by deionized water to remove impurities, and placed in an oven to be dried at constant temperature to obtain the walnut shell particles.
Step two: heating the walnut shell particles obtained in the step one to 600 ℃ in a tube furnace at the temperature of 4 ℃/s in N 2 Carbonizing for 1h under the atmosphere to obtain B-AC;
step three: heating the carbonized walnut shells obtained in the step two to 800 ℃ at the mass ratio of 1 ℃/s to KOH in a tubular furnace at the temperature of 4 ℃/s, wherein the mass ratio of the carbon B-AC to the KOH is 2 Chemical activation is carried out for 1h under the atmosphere;
step four: and (4) soaking the KOH-activated carbon obtained in the step three in a 5M HCl solution for 8 hours to remove ash and impurities, washing the carbon with a large amount of deionized water to be neutral, and then putting the carbon into a constant-temperature oven for drying overnight to obtain the K-AC.
Step five: putting the K-AC into an ethanol solvent, performing ultrasonic treatment for 10min at the power of 40kHz, filtering, and drying at constant temperature to obtain activated carbon AC subjected to chemical and physical activation T10W40 。
Example 5
A modification method for improving the adsorption breakthrough time of walnut shell-based active carbon toluene comprises the following steps:
firstly, the walnut shell based active carbon is chemically activated, and the specific implementation steps are as follows
The method comprises the following steps: the walnut shells are cleaned, crushed and sieved by 30-40 meshes, washed by deionized water to remove impurities, and placed in an oven to be dried at constant temperature to obtain the walnut shell particles.
Step two: the walnut shell obtained in the step oneThe granules are heated in a tube furnace at 4 ℃/s to 600 ℃ in N 2 Carbonizing for 1h under the atmosphere to obtain B-AC;
step three: heating the carbonized walnut shells obtained in the step two to 800 ℃ at the mass ratio of 1 ℃/s to KOH in a tubular furnace at the temperature of 4 ℃/s, wherein the mass ratio of the carbon B-AC to the KOH is 2 Chemical activation is carried out for 1h under the atmosphere;
step four: and (3) soaking the carbon activated by the KOH obtained in the step three in a 5M HCl solution for 8 hours to remove ash and impurities, washing the carbon with a large amount of deionized water to be neutral, and then putting the carbon into a constant-temperature oven to be dried overnight to obtain the K-AC.
Step five: putting the K-AC into an ethanol solvent, performing ultrasonic treatment for 20min at the power of 40kHz, filtering, and drying at constant temperature to obtain activated carbon AC subjected to chemical and physical activation T20W40 。
Example 6
A modification method for improving the adsorption breakthrough time of walnut shell-based active carbon toluene comprises the following steps:
firstly, the walnut shell based active carbon is chemically activated, and the specific implementation steps are as follows
The method comprises the following steps: the walnut shells are cleaned, crushed and sieved by a 30-40 mesh sieve, washed by deionized water to remove impurities, and placed in an oven for drying at constant temperature to obtain walnut shell particles.
Step two: heating the walnut shell particles obtained in the step one to 600 ℃ in a tubular furnace at the temperature of 4 ℃/s, and heating the walnut shell particles in N 2 Carbonizing for 1h under the atmosphere to obtain B-AC;
step three: heating the carbonized walnut shells obtained in the step two to 800 ℃ at the temperature of 4 ℃/s in a tubular furnace according to the mass ratio of 1 2 Chemical activation is carried out for 1h under the atmosphere;
step four: and (4) soaking the KOH-activated carbon obtained in the step three in a 5M HCl solution for 8 hours to remove ash and impurities, washing the carbon with a large amount of deionized water to be neutral, and then putting the carbon into a constant-temperature oven for drying overnight to obtain the K-AC.
Step five: putting K-AC in ethanol solvent, performing ultrasonic treatment at 40kHz for 30min, filtering, and drying at constant temperature to obtain chemical and physical activationPost activated carbon AC T30W40 。
In the figure, figure 1 shows activated carbon K-AC after chemical activation and AC after chemical and physical activation T10W40 Adsorption breakthrough curve chart; FIG. 2 is a graph showing the breakthrough of adsorption of activated carbon by physical ultrasonic activation at 10-40kHz for the same time of 10 min;
FIG. 3 is a graph showing the breakthrough of adsorption of activated carbon activated by physical ultrasound at the same power of 40kHz for 10-30 min.
As can be seen from the figure, under the same conditions (50 mg of adsorbent in a toluene adsorption bed with initial concentration of 650 ppm), the adsorption breakthrough time of the chemically activated carbon K-AC is 90min, and the adsorption breakthrough time of the chemically activated and physically activated carbon ACs is 138min, which is increased by 48min.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (10)
1. A modification method for improving the toluene adsorption breakthrough time of walnut shell-based activated carbon is characterized by comprising the following steps:
the method comprises the following steps: cleaning walnut shells, crushing, sieving, removing impurities, and placing the walnut shells in a drying oven for drying at constant temperature to obtain walnut shell particles;
step two: sintering the walnut shell particles obtained in the step one at a high temperature to obtain B-AC;
step three: mixing the carbonized carbon B-AC of the walnut shells obtained in the step two with KOH, sintering again, and completing chemical activation to obtain KOH activated carbon;
step four: soaking the KOH-activated carbon obtained in the step three in an HCl solution to remove ash and impurities, washing the carbon to be neutral by using deionized water, and then putting the carbon into a constant-temperature oven to be dried overnight to obtain chemically activated carbon K-AC;
step five: and putting the K-AC obtained in the fourth step into an ethanol solvent for ultrasonic treatment, filtering, and drying at constant temperature to obtain the target activated carbon ACs.
2. The modification method for improving the toluene adsorption breakthrough time of walnut shell-based activated carbon as claimed in claim 1, wherein in the first step, the walnut shell is sieved by 30-40 meshes.
3. The modification method for improving the toluene adsorption breakthrough time of the walnut shell-based activated carbon as claimed in claim 1, wherein in the first step, the impurity removal is performed by washing with deionized water to remove the impurity, and placing in an oven at a constant temperature.
4. The modification method for improving the toluene adsorption breakthrough time of the walnut shell-based activated carbon as claimed in claim 1, wherein in the second step, the sintering is performed in a tube furnace, the heating rate is 4 ℃/s, the heating temperature is 600 ℃, the sintering is performed in a nitrogen atmosphere, and the sintering time is 1h.
5. The modification method for improving the toluene adsorption breakthrough time of the walnut shell-based activated carbon as claimed in claim 1, wherein in the third step, B-AC is mixed with KOH in a mass ratio of 1.
6. The modification method for improving the toluene adsorption breakthrough time of the walnut shell-based activated carbon as claimed in claim 1, wherein in the third step, the re-sintering is performed in a tube furnace, the temperature rising rate is 4 ℃/s, the temperature rising temperature is 800 ℃, the sintering is performed in the nitrogen atmosphere, and the sintering time is 1h.
7. The modification method for improving the toluene adsorption breakthrough time of walnut shell-based activated carbon as claimed in claim 1, wherein in the fourth step, the concentration of HCl solution is 5mol/L, and the soaking time is 8h.
8. The modification method for improving the toluene adsorption breakthrough time of the walnut shell-based activated carbon as claimed in claim 1, wherein in the fourth step, the power of ultrasound is 10-40kHz, and the time is 10-20min.
9. The modification method for improving the toluene adsorption breakthrough time of walnut shell-based activated carbon as claimed in claim 1, wherein the drying time of the first step, the fourth step and the fifth step is 12h.
10. The modification method for improving the toluene adsorption breakthrough time of walnut shell-based activated carbon according to claim 1, wherein the oven temperature in the first step is 100 ℃; the oven temperature of the fourth step is 110 ℃; the oven temperature of the fifth step is 80 ℃.
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